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/*

 * MSI-X device support

 *

 * This module includes support for MSI-X in pci devices.

 *

 * Author: Michael S. Tsirkin <mst@redhat.com>

 *

 *  Copyright (c) 2009, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 * Contributions after 2012-01-13 are licensed under the terms of the

 * GNU GPL, version 2 or (at your option) any later version.

 */

#include "hw.h"

#include "msi.h"

#include "msix.h"

#include "pci.h"

#include "range.h"

#define MSIX_CAP_LENGTH 12

/* MSI enable bit and maskall bit are in byte 1 in FLAGS register */

#define MSIX_CONTROL_OFFSET (PCI_MSIX_FLAGS + 1)

#define MSIX_ENABLE_MASK (PCI_MSIX_FLAGS_ENABLE >> 8)

#define MSIX_MASKALL_MASK (PCI_MSIX_FLAGS_MASKALL >> 8)

static MSIMessage msix_get_message(PCIDevice *dev, unsigned vector)

{

    uint8_t *table_entry = dev->msix_table + vector * PCI_MSIX_ENTRY_SIZE;

    MSIMessage msg;

    msg.address = pci_get_quad(table_entry + PCI_MSIX_ENTRY_LOWER_ADDR);

    msg.data = pci_get_long(table_entry + PCI_MSIX_ENTRY_DATA);

    return msg;

}

/*

 * Special API for POWER to configure the vectors through

 * a side channel. Should never be used by devices.

 */

void msix_set_message(PCIDevice *dev, int vector, struct MSIMessage msg)

{

    uint8_t *table_entry = dev->msix_table + vector * PCI_MSIX_ENTRY_SIZE;

    pci_set_quad(table_entry + PCI_MSIX_ENTRY_LOWER_ADDR, msg.address);

    pci_set_long(table_entry + PCI_MSIX_ENTRY_DATA, msg.data);

    table_entry[PCI_MSIX_ENTRY_VECTOR_CTRL] &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;

}

static uint8_t msix_pending_mask(int vector)

{

    return 1 << (vector % 8);

}

static uint8_t *msix_pending_byte(PCIDevice *dev, int vector)

{

    return dev->msix_pba + vector / 8;

}

static int msix_is_pending(PCIDevice *dev, int vector)

{

    return *msix_pending_byte(dev, vector) & msix_pending_mask(vector);

}

static void msix_set_pending(PCIDevice *dev, int vector)

{

    *msix_pending_byte(dev, vector) |= msix_pending_mask(vector);

}

static void msix_clr_pending(PCIDevice *dev, int vector)

{

    *msix_pending_byte(dev, vector) &= ~msix_pending_mask(vector);

}

static bool msix_vector_masked(PCIDevice *dev, int vector, bool fmask)

{

    unsigned offset = vector * PCI_MSIX_ENTRY_SIZE + PCI_MSIX_ENTRY_VECTOR_CTRL;

    return fmask || dev->msix_table[offset] & PCI_MSIX_ENTRY_CTRL_MASKBIT;

}

static bool msix_is_masked(PCIDevice *dev, int vector)

{

    return msix_vector_masked(dev, vector, dev->msix_function_masked);

}

static void msix_fire_vector_notifier(PCIDevice *dev,

                                      unsigned int vector, bool is_masked)

{

    MSIMessage msg;

    int ret;

    if (!dev->msix_vector_use_notifier) {

        return;

    }

    if (is_masked) {

        dev->msix_vector_release_notifier(dev, vector);

    } else {

        msg = msix_get_message(dev, vector);

        ret = dev->msix_vector_use_notifier(dev, vector, msg);

        assert(ret >= 0);

    }

}

static void msix_handle_mask_update(PCIDevice *dev, int vector, bool was_masked)

{

    bool is_masked = msix_is_masked(dev, vector);

    if (is_masked == was_masked) {

        return;

    }

    msix_fire_vector_notifier(dev, vector, is_masked);

    if (!is_masked && msix_is_pending(dev, vector)) {

        msix_clr_pending(dev, vector);

        msix_notify(dev, vector);

    }

}

static void msix_update_function_masked(PCIDevice *dev)

{

    dev->msix_function_masked = !msix_enabled(dev) ||

        (dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] & MSIX_MASKALL_MASK);

}

/* Handle MSI-X capability config write. */

void msix_write_config(PCIDevice *dev, uint32_t addr,

                       uint32_t val, int len)

{

    unsigned enable_pos = dev->msix_cap + MSIX_CONTROL_OFFSET;

    int vector;

    bool was_masked;

    if (!msix_present(dev) || !range_covers_byte(addr, len, enable_pos)) {

        return;

    }

    was_masked = dev->msix_function_masked;

    msix_update_function_masked(dev);

    if (!msix_enabled(dev)) {

        return;

    }

    pci_device_deassert_intx(dev);

    if (dev->msix_function_masked == was_masked) {

        return;

    }

    for (vector = 0; vector < dev->msix_entries_nr; ++vector) {

        msix_handle_mask_update(dev, vector,

                                msix_vector_masked(dev, vector, was_masked));

    }

}

static uint64_t msix_table_mmio_read(void *opaque, target_phys_addr_t addr,

                                     unsigned size)

{

    PCIDevice *dev = opaque;

    return pci_get_long(dev->msix_table + addr);

}

static void msix_table_mmio_write(void *opaque, target_phys_addr_t addr,

                                  uint64_t val, unsigned size)

{

    PCIDevice *dev = opaque;

    int vector = addr / PCI_MSIX_ENTRY_SIZE;

    bool was_masked;

    was_masked = msix_is_masked(dev, vector);

    pci_set_long(dev->msix_table + addr, val);

    msix_handle_mask_update(dev, vector, was_masked);

}

static const MemoryRegionOps msix_table_mmio_ops = {

    .read = msix_table_mmio_read,

    .write = msix_table_mmio_write,

    /* TODO: MSIX should be LITTLE_ENDIAN. */

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

static uint64_t msix_pba_mmio_read(void *opaque, target_phys_addr_t addr,

                                   unsigned size)

{

    PCIDevice *dev = opaque;

    return pci_get_long(dev->msix_pba + addr);

}

static const MemoryRegionOps msix_pba_mmio_ops = {

    .read = msix_pba_mmio_read,

    /* TODO: MSIX should be LITTLE_ENDIAN. */

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

static void msix_mask_all(struct PCIDevice *dev, unsigned nentries)

{

    int vector;

    for (vector = 0; vector < nentries; ++vector) {

        unsigned offset =

            vector * PCI_MSIX_ENTRY_SIZE + PCI_MSIX_ENTRY_VECTOR_CTRL;

        bool was_masked = msix_is_masked(dev, vector);

        dev->msix_table[offset] |= PCI_MSIX_ENTRY_CTRL_MASKBIT;

        msix_handle_mask_update(dev, vector, was_masked);

    }

}

/* Initialize the MSI-X structures */

int msix_init(struct PCIDevice *dev, unsigned short nentries,

              MemoryRegion *table_bar, uint8_t table_bar_nr,

              unsigned table_offset, MemoryRegion *pba_bar,

              uint8_t pba_bar_nr, unsigned pba_offset, uint8_t cap_pos)

{

    int cap;

    unsigned table_size, pba_size;

    uint8_t *config;

    /* Nothing to do if MSI is not supported by interrupt controller */

    if (!msi_supported) {

        return -ENOTSUP;

    }

    if (nentries < 1 || nentries > PCI_MSIX_FLAGS_QSIZE + 1) {

        return -EINVAL;

    }

    table_size = nentries * PCI_MSIX_ENTRY_SIZE;

    pba_size = QEMU_ALIGN_UP(nentries, 64) / 8;

    /* Sanity test: table & pba don't overlap, fit within BARs, min aligned */

    if ((table_bar_nr == pba_bar_nr &&

         ranges_overlap(table_offset, table_size, pba_offset, pba_size)) ||

        table_offset + table_size > memory_region_size(table_bar) ||

        pba_offset + pba_size > memory_region_size(pba_bar) ||

        (table_offset | pba_offset) & PCI_MSIX_FLAGS_BIRMASK) {

        return -EINVAL;

    }

    cap = pci_add_capability(dev, PCI_CAP_ID_MSIX, cap_pos, MSIX_CAP_LENGTH);

    if (cap < 0) {

        return cap;

    }

    dev->msix_cap = cap;

    dev->cap_present |= QEMU_PCI_CAP_MSIX;

    config = dev->config + cap;

    pci_set_word(config + PCI_MSIX_FLAGS, nentries - 1);

    dev->msix_entries_nr = nentries;

    dev->msix_function_masked = true;

    pci_set_long(config + PCI_MSIX_TABLE, table_offset | table_bar_nr);

    pci_set_long(config + PCI_MSIX_PBA, pba_offset | pba_bar_nr);

    /* Make flags bit writable. */

    dev->wmask[cap + MSIX_CONTROL_OFFSET] |= MSIX_ENABLE_MASK |

                                             MSIX_MASKALL_MASK;

    dev->msix_table = g_malloc0(table_size);

    dev->msix_pba = g_malloc0(pba_size);

    dev->msix_entry_used = g_malloc0(nentries * sizeof *dev->msix_entry_used);

    msix_mask_all(dev, nentries);

    memory_region_init_io(&dev->msix_table_mmio, &msix_table_mmio_ops, dev,

                          "msix-table", table_size);

    memory_region_add_subregion(table_bar, table_offset, &dev->msix_table_mmio);

    memory_region_init_io(&dev->msix_pba_mmio, &msix_pba_mmio_ops, dev,

                          "msix-pba", pba_size);

    memory_region_add_subregion(pba_bar, pba_offset, &dev->msix_pba_mmio);

    return 0;

}

int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries,

                            uint8_t bar_nr)

{

    int ret;

    char *name;

    /*

     * Migration compatibility dictates that this remains a 4k

     * BAR with the vector table in the lower half and PBA in

     * the upper half.  Do not use these elsewhere!

     */

#define MSIX_EXCLUSIVE_BAR_SIZE 4096

#define MSIX_EXCLUSIVE_BAR_TABLE_OFFSET 0

#define MSIX_EXCLUSIVE_BAR_PBA_OFFSET (MSIX_EXCLUSIVE_BAR_SIZE / 2)

#define MSIX_EXCLUSIVE_CAP_OFFSET 0

    if (nentries * PCI_MSIX_ENTRY_SIZE > MSIX_EXCLUSIVE_BAR_PBA_OFFSET) {

        return -EINVAL;

    }

    name = g_strdup_printf("%s-msix", dev->name);

    memory_region_init(&dev->msix_exclusive_bar, name, MSIX_EXCLUSIVE_BAR_SIZE);

    g_free(name);

    ret = msix_init(dev, nentries, &dev->msix_exclusive_bar, bar_nr,

                    MSIX_EXCLUSIVE_BAR_TABLE_OFFSET, &dev->msix_exclusive_bar,

                    bar_nr, MSIX_EXCLUSIVE_BAR_PBA_OFFSET,

                    MSIX_EXCLUSIVE_CAP_OFFSET);

    if (ret) {

        memory_region_destroy(&dev->msix_exclusive_bar);

        return ret;

    }

    pci_register_bar(dev, bar_nr, PCI_BASE_ADDRESS_SPACE_MEMORY,

                     &dev->msix_exclusive_bar);

    return 0;

}

static void msix_free_irq_entries(PCIDevice *dev)

{

    int vector;

    for (vector = 0; vector < dev->msix_entries_nr; ++vector) {

        dev->msix_entry_used[vector] = 0;

        msix_clr_pending(dev, vector);

    }

}

static void msix_clear_all_vectors(PCIDevice *dev)

{

    int vector;

    for (vector = 0; vector < dev->msix_entries_nr; ++vector) {

        msix_clr_pending(dev, vector);

    }

}

/* Clean up resources for the device. */

void msix_uninit(PCIDevice *dev, MemoryRegion *table_bar, MemoryRegion *pba_bar)

{

    if (!msix_present(dev)) {

        return;

    }

    pci_del_capability(dev, PCI_CAP_ID_MSIX, MSIX_CAP_LENGTH);

    dev->msix_cap = 0;

    msix_free_irq_entries(dev);

    dev->msix_entries_nr = 0;

    memory_region_del_subregion(pba_bar, &dev->msix_pba_mmio);

    memory_region_destroy(&dev->msix_pba_mmio);

    g_free(dev->msix_pba);

    dev->msix_pba = NULL;

    memory_region_del_subregion(table_bar, &dev->msix_table_mmio);

    memory_region_destroy(&dev->msix_table_mmio);

    g_free(dev->msix_table);

    dev->msix_table = NULL;

    g_free(dev->msix_entry_used);

    dev->msix_entry_used = NULL;

    dev->cap_present &= ~QEMU_PCI_CAP_MSIX;

}

void msix_uninit_exclusive_bar(PCIDevice *dev)

{

    if (msix_present(dev)) {

        msix_uninit(dev, &dev->msix_exclusive_bar, &dev->msix_exclusive_bar);

        memory_region_destroy(&dev->msix_exclusive_bar);

    }

}

void msix_save(PCIDevice *dev, QEMUFile *f)

{

    unsigned n = dev->msix_entries_nr;

    if (!msix_present(dev)) {

        return;

    }

    qemu_put_buffer(f, dev->msix_table, n * PCI_MSIX_ENTRY_SIZE);

    qemu_put_buffer(f, dev->msix_pba, (n + 7) / 8);

}

/* Should be called after restoring the config space. */

void msix_load(PCIDevice *dev, QEMUFile *f)

{

    unsigned n = dev->msix_entries_nr;

    unsigned int vector;

    if (!msix_present(dev)) {

        return;

    }

    msix_clear_all_vectors(dev);

    qemu_get_buffer(f, dev->msix_table, n * PCI_MSIX_ENTRY_SIZE);

    qemu_get_buffer(f, dev->msix_pba, (n + 7) / 8);

    msix_update_function_masked(dev);

    for (vector = 0; vector < n; vector++) {

        msix_handle_mask_update(dev, vector, true);

    }

}

/* Does device support MSI-X? */

int msix_present(PCIDevice *dev)

{

    return dev->cap_present & QEMU_PCI_CAP_MSIX;

}

/* Is MSI-X enabled? */

int msix_enabled(PCIDevice *dev)

{

    return (dev->cap_present & QEMU_PCI_CAP_MSIX) &&

        (dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &

         MSIX_ENABLE_MASK);

}

/* Send an MSI-X message */

void msix_notify(PCIDevice *dev, unsigned vector)

{

    MSIMessage msg;

    if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector])

        return;

    if (msix_is_masked(dev, vector)) {

        msix_set_pending(dev, vector);

        return;

    }

    msg = msix_get_message(dev, vector);

    stl_le_phys(msg.address, msg.data);

}

void msix_reset(PCIDevice *dev)

{

    if (!msix_present(dev)) {

        return;

    }

    msix_clear_all_vectors(dev);

    dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &=

            ~dev->wmask[dev->msix_cap + MSIX_CONTROL_OFFSET];

    memset(dev->msix_table, 0, dev->msix_entries_nr * PCI_MSIX_ENTRY_SIZE);

    memset(dev->msix_pba, 0, QEMU_ALIGN_UP(dev->msix_entries_nr, 64) / 8);

    msix_mask_all(dev, dev->msix_entries_nr);

}

/* PCI spec suggests that devices make it possible for software to configure

 * less vectors than supported by the device, but does not specify a standard

 * mechanism for devices to do so.

 *

 * We support this by asking devices to declare vectors software is going to

 * actually use, and checking this on the notification path. Devices that

 * don't want to follow the spec suggestion can declare all vectors as used. */

/* Mark vector as used. */

int msix_vector_use(PCIDevice *dev, unsigned vector)

{

    if (vector >= dev->msix_entries_nr)

        return -EINVAL;

    dev->msix_entry_used[vector]++;

    return 0;

}

/* Mark vector as unused. */

void msix_vector_unuse(PCIDevice *dev, unsigned vector)

{

    if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector]) {

        return;

    }

    if (--dev->msix_entry_used[vector]) {

        return;

    }

    msix_clr_pending(dev, vector);

}

void msix_unuse_all_vectors(PCIDevice *dev)

{

    if (!msix_present(dev)) {

        return;

    }

    msix_free_irq_entries(dev);

}

unsigned int msix_nr_vectors_allocated(const PCIDevice *dev)

{

    return dev->msix_entries_nr;

}

static int msix_set_notifier_for_vector(PCIDevice *dev, unsigned int vector)

{

    MSIMessage msg;

    if (msix_is_masked(dev, vector)) {

        return 0;

    }

    msg = msix_get_message(dev, vector);

    return dev->msix_vector_use_notifier(dev, vector, msg);

}

static void msix_unset_notifier_for_vector(PCIDevice *dev, unsigned int vector)

{

    if (msix_is_masked(dev, vector)) {

        return;

    }

    dev->msix_vector_release_notifier(dev, vector);

}

int msix_set_vector_notifiers(PCIDevice *dev,

                              MSIVectorUseNotifier use_notifier,

                              MSIVectorReleaseNotifier release_notifier)

{

    int vector, ret;

    assert(use_notifier && release_notifier);

    dev->msix_vector_use_notifier = use_notifier;

    dev->msix_vector_release_notifier = release_notifier;

    if ((dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &

        (MSIX_ENABLE_MASK | MSIX_MASKALL_MASK)) == MSIX_ENABLE_MASK) {

        for (vector = 0; vector < dev->msix_entries_nr; vector++) {

            ret = msix_set_notifier_for_vector(dev, vector);

            if (ret < 0) {

                goto undo;

            }

        }

    }

    return 0;

undo:

    while (--vector >= 0) {

        msix_unset_notifier_for_vector(dev, vector);

    }

    dev->msix_vector_use_notifier = NULL;

    dev->msix_vector_release_notifier = NULL;

    return ret;

}

void msix_unset_vector_notifiers(PCIDevice *dev)

{

    int vector;

    assert(dev->msix_vector_use_notifier &&

           dev->msix_vector_release_notifier);

    if ((dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &

        (MSIX_ENABLE_MASK | MSIX_MASKALL_MASK)) == MSIX_ENABLE_MASK) {

        for (vector = 0; vector < dev->msix_entries_nr; vector++) {

            msix_unset_notifier_for_vector(dev, vector);

        }

    }

    dev->msix_vector_use_notifier = NULL;

    dev->msix_vector_release_notifier = NULL;

}